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$147+ Cheap flights from Luis Munoz Marin Intl (SJU) to Ontario (ONT)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/4. Fares are subject to change and may not be available on all flights or dates of travel.
SJU — ONT
Nov 1 — Nov 81
Sat 11/1
Sat 11/8
1 adult, Economy
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Cheap flight deals from Luis Munoz Marin Intl to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Luis Munoz Marin Intl (SJU) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated October 2, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$359
(Frontier)

One-way from

$147
(Kiwi.com)

Popular in

January

Cheapest in

July

Average price

$405
Provider with most accurate pricing for San Juan Luis Munoz Marin Intl-Ontario flight deals.
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Provider most trusted by Cheapflights users for San Juan Luis Munoz Marin Intl-Ontario flights.
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From San Juan Luis Munoz Marin Intl to Ontario
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One-way flight from San Juan Luis Munoz Marin Intl to Ontario
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Highest demand for flights based on searches. 15% potential increase in price ($87 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($16 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Find flight deals from Luis Munoz Marin Intl to Ontario

Cheapest flights from Luis Munoz Marin Intl to Ontario
Explore the most affordable flight options available from Luis Munoz Marin Intl to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 2, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/192:49 amSJU - ONT
2 stops16h 39mMultiple Airlines
Thu 10/234:17 pmONT - SJU
1 stop21h 06mMultiple Airlines
Deal found 9/30$379
This Frontier deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/193:40 amSJU - ONT
2 stops15h 48mFrontier
Thu 10/2312:32 pmONT - SJU
2 stops18h 10mFrontier
Deal found 9/30$386
This Frontier deal was found by Cheapflights users on 10/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/610:39 pmSJU - ONT
2 stops18h 12mFrontier
Thu 11/137:44 pmONT - SJU
2 stops15h 35mFrontier
Deal found 10/1$392
This Frontier deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/221:59 amSJU - ONT
2 stops16h 33mFrontier
Sun 10/2612:49 pmONT - SJU
2 stops17h 53mFrontier
Deal found 9/30$397
This Frontier deal was found by Cheapflights users on 10/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/226:22 amSJU - ONT
2 stops20h 28mFrontier
Sun 10/2612:49 pmONT - SJU
2 stops17h 53mFrontier
Deal found 10/1$429
This Frontier deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/243:05 pmSJU - ONT
2 stops19h 44mFrontier
Sun 10/2612:49 pmONT - SJU
2 stops17h 53mFrontier
Deal found 9/30$431
This United Airlines deal was found by Cheapflights users on 10/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/222:55 pmSJU - ONT
1 stop9h 29mUnited Airlines
Sat 10/256:00 amONT - SJU
1 stop11h 38mUnited Airlines
Deal found 10/1$445
This United Airlines deal was found by Cheapflights users on 10/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/232:55 pmSJU - ONT
1 stop9h 29mUnited Airlines
Sun 10/267:00 amONT - SJU
1 stop10h 00mUnited Airlines
Deal found 10/1$480
This Frontier deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/19:26 pmSJU - ONT
2 stops17h 12mFrontier
Wed 10/86:53 amONT - SJU
2 stops16h 37mFrontier
Deal found 9/30$529

Cheapflights Fare Finder

 
Customize your flight search to find flights from Luis Munoz Marin Intl to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated October 2, 2025.
Use the filters below to find and compare flights from San Juan Luis Munoz Marin Intl Airport to Ontario that are best for you.

Fly from

Luis Munoz Marin Intl

Fly to

Ontario

Route

Depart

Return

Price

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Wed 10/22

1:59 am-3:32 pm

2 stops16h 33m

Ontario

Sun 10/26

12:49 pm-9:42 am

2 stops17h 53m

$379

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Thu 11/6

10:39 pm-12:51 pm

2 stops18h 12m

Ontario

Thu 11/13

7:44 pm-3:19 pm

2 stops15h 35m

$392

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Wed 10/22

6:22 am-11:50 pm

2 stops20h 28m

Ontario

Sun 10/26

12:49 pm-9:42 am

2 stops17h 53m

$429

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Fri 10/31

10:39 pm-11:10 am

2 stops15h 31m

Ontario

Fri 11/7

7:23 pm-5:54 pm

2 stops18h 31m

$429

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Sat 11/1

3:04 am-12:10 pm

2 stops12h 06m

Ontario

Mon 11/3

7:44 pm-5:54 pm

2 stops18h 10m

$429

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Fri 12/5

2:25 pm-8:42 pm

1 stop10h 17m

Ontario

Mon 1/12

6:00 am-9:26 pm

1 stop11h 26m

$445

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Tue 1/20

2:25 pm-8:58 pm

1 stop10h 33m

Ontario

Sun 1/25

6:00 am-9:26 pm

1 stop11h 26m

$445

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Wed 10/22

2:55 pm-9:24 pm

1 stop9h 29m

Ontario

Sun 10/26

7:00 am-8:00 pm

1 stop10h 00m

$445

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Fri 2/6

3:46 pm-9:58 pm

1 stop10h 12m

Ontario

Mon 2/9

5:05 am-6:25 pm

1 stop9h 20m

$445

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Wed 10/22

2:55 pm-9:24 pm

1 stop9h 29m

Ontario

Sat 10/25

6:00 am-8:38 pm

1 stop11h 38m

$445

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/1

Showing 1-10 of 19 results
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Compare providers for flights from Luis Munoz Marin Intl to Ontario

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Luis Munoz Marin Intl to Ontario in October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on San Juan Luis Munoz Marin Intl Airport-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on San Juan Luis Munoz Marin Intl Airport-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from San Juan Luis Munoz Marin Intl Airport-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on San Juan Luis Munoz Marin Intl Airport-Ontario flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for San Juan Luis Munoz Marin Intl Airport-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Luis Munoz Marin Intl to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Luis Munoz Marin Intl with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from San Juan Luis Munoz Marin Intl Airport to Ontario

What is the cheapest month to book a flight from San Juan Luis Munoz Marin Intl Airport to Ontario?

Currently, August is the cheapest month in which you can book a flight from San Juan Luis Munoz Marin Intl Airport to Ontario (average of $246). Flying from San Juan Luis Munoz Marin Intl Airport to Ontario in March is currently the most expensive (average of $327). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SJU to ONT?

Find hourly flight availability from Luis Munoz Marin Intl to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 2, 2025.

A simple way to save on the total cost of your ticket is to fly from San Juan Luis Munoz Marin Intl Airport to Ontario in the morning. If you’re flexible enough to do this you can expect to save up to 46% on your trip compared to booking a flight in the afternoon.

How much does it cost to fly round-trip from San Juan Luis Munoz Marin Intl Airport to Ontario?

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated October 2, 2025.
Read reviews from past customers who have flown Delta, United Airlines, and American Airlines from San Juan Luis Munoz Marin Intl Airport to Ontario. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,962 reviews

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very good
7,962 reviews
Delta
8.0
Very good
7,962 reviews

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
United Airlines
7.4
Good
8,933 reviews
Delta
8.0
Very good
7,962 reviews

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
American Airlines
7.2
Good
11,033 reviews
Delta
8.0
Very good
7,962 reviews

Overall

8.0

Food

7.3

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

Find useful and relevant information for your journey from Luis Munoz Marin Intl to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Ontario from San Juan Luis Munoz Marin Intl?

    If you book a flight to Ontario from San Juan Luis Munoz Marin Intl, you will be flying to Ontario, which is the city’s only airport. Ontario (ONT) is located 3.1 mi from the center of Ontario. There are 0 flights from San Juan Luis Munoz Marin Intl to Ontario per day from 3 different airlines.

  • How long is the flight from San Juan Luis Munoz Marin Intl Airport to Ontario?

    Airlines like Frontier fly from San Juan Luis Munoz Marin Intl Airport to Ontario in about 16h 33m. The time it takes to get you to your destination can typically vary by up to . The distance from San Juan Luis Munoz Marin Intl Airport to Ontario is about 3334 mi.

  • What are the cheapest airlines flying from San Juan Luis Munoz Marin Intl Airport to Ontario round-trip?

    Our cheapest airline available from San Juan Luis Munoz Marin Intl Airport to Ontario is Delta. Our recent data shows that you can find tickets from as low as $344 on this airline. Additional options worth looking into are American Airlines and United Airlines, starting at $355 and $433 round-trip. Users have found that Delta is 30% cheaper than the other options available to this destination.

  • Can I find deals for flights from Luis Munoz Marin Intl to Ontario that include hotel bookings?

    Yes. In addition to deals on Luis Munoz Marin Intl to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Luis Munoz Marin Intl to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Luis Munoz Marin Intl to Ontario.

  • Can I find deals for business class flights from Luis Munoz Marin Intl to Ontario?

    Yes. Cheapflights offers flight deals from Luis Munoz Marin Intl to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from San Juan Luis Munoz Marin Intl Airport to Ontario?

    Currently, August is the cheapest month in which you can book a flight from San Juan Luis Munoz Marin Intl Airport to Ontario (average of $246). Flying from San Juan Luis Munoz Marin Intl Airport to Ontario in March is currently the most expensive (average of $327). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Top 3 airlines flying from Luis Munoz Marin Intl to Ontario

Discover the top 3 airlines that operate flights from Luis Munoz Marin Intl to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated October 2, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$344Average$570FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$355Average$600FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$433Average$656FlexibilityNo cancel feeOn-time69%

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